CN110965204A - Net forming device and method for forming self-leveling by suction coating and free fall and product - Google Patents
Net forming device and method for forming self-leveling by suction coating and free fall and product Download PDFInfo
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- CN110965204A CN110965204A CN201911262177.8A CN201911262177A CN110965204A CN 110965204 A CN110965204 A CN 110965204A CN 201911262177 A CN201911262177 A CN 201911262177A CN 110965204 A CN110965204 A CN 110965204A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000011248 coating agent Substances 0.000 title claims description 17
- 238000000576 coating method Methods 0.000 title claims description 17
- 239000000835 fiber Substances 0.000 claims abstract description 138
- 238000001179 sorption measurement Methods 0.000 claims abstract description 50
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 238000009960 carding Methods 0.000 claims description 64
- 239000000428 dust Substances 0.000 claims description 35
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000009950 felting Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
- D01G15/02—Carding machines
- D01G15/04—Carding machines with worker and stripper or like rollers operating in association with a main cylinder
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
- D01G15/02—Carding machines
- D01G15/10—Carding machines with other apparatus, e.g. drafting devices, in integral or closely-associated combination
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
- D01G15/02—Carding machines
- D01G15/12—Details
- D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
- D01G15/50—Stripping-rollers or like devices
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
The invention discloses a negative pressure adsorption free-falling type self-leveling air-laid device, an air-laid method and a product, wherein the device comprises an air-laid mechanism, and the air-laid mechanism comprises a negative pressure adsorption device and a laid conveying net; an air suction port of the negative pressure adsorption device is positioned in the net-forming conveying net; a net forming surface is formed on the net forming conveying net at the air suction port, the net forming surface is inclined downwards, vertically downwards or horizontally downwards, and a free falling area is arranged below the net forming surface. The air-laid method is to obtain a uniform fiber web on the web-forming surface by the principle that the adsorption force is less than the gravity of the fibers. The article is an article obtained by the above apparatus and method. The invention has even thickness of the formed net and wide application range.
Description
Technical Field
The invention relates to an air-laid device, an air-laid method and a product, in particular to a suction coating and free fall self-leveling net-forming device and an air-laid method.
Background
In dry nonwoven production processes, air-laying is one of the important forms of web formation, especially for short fiber webs.
At present, the air-laid web mainly comprises a free falling air-laid web, a press-in air-laid web, a suction air-laid web, a closed circulation air-laid web and a press-suction combined air-laid web.
As shown in fig. 1, after the fibers are conveyed to the cylinder 1 by the conveying roller 4, when the cylinder carrying the fibers reaches the wool stripping roller 50 under the rotation of the cylinder, the fibers freely fall onto the output web 6 under the self-gravity of the fibers, and are formed into a web on the output web 6. In this way, if the fibers are not uniformly caught by the cylinder and the falling fibers are disturbed by the flow of the external air and the degree of dispersion of the fibers is not uniform, the gravity is different and the falling time of the fibers is different, the thickness of the web is not uniform in the transverse and longitudinal directions during the web forming process, and thus, the web formation is not uniform.
As shown in fig. 2, the press-in type air-laying device comprises a cylinder 1, a conveying roller 4 positioned at the input side of the cylinder 1, a dust cage 2 positioned at the output side of the cylinder 1, and an output net curtain 6 positioned at the output side of the dust cage 2, wherein a wind blocking roller 5 is arranged at the output end of a net-forming area of the dust cage 2, and the press-in type air-laying device also comprises a fan 3, when the conveying roller 4 conveys fibers onto the cylinder 1, the fibers are brought into the output side of the cylinder 1 under the action of the cylinder 1, the fibers are attached onto the dust cage 2 under the action of press-in type air flow under the action of the fan 3, and under the rotation action of the dust cage 2, the fibers are reversely blocked by the wind blocking roller 5, and are laid on the dust cage 2, and the net-formed is conveyed onto. In this way, as the fibres are laid on the cage by the forced air, they are pressed continuously into the cage, so that, for example, the fibre feed is uneven, the fibres coming from the cylinder are uneven, and, for example, the fibres have different lengths and diameters, different speeds and times leading to the cage and disturbances from the external air flow, which cause uneven laying.
As shown in fig. 3, the suction type air-laying device comprises a cylinder 1, a conveying roller 4 positioned at the input side of the cylinder 1, a dust cage 2 positioned at the output side of the cylinder 1, an output net curtain 6 positioned at the output side of the dust cage 2, a wind shielding roller 5 arranged at the output end of a net forming area of the dust cage 2, and a fan 3. After the fibers are conveyed to the cylinder 1 by the conveying roller 4, the fibers are brought to the output side of the cylinder 1 under the action of the cylinder 1, the fibers are adsorbed to the dust cage 2 under the adsorption action of the fan 3, and under the rotation action of the dust cage 2, the fibers are blocked by the wind blocking roller 5 to form a net on the dust cage 2, and the net is conveyed to the output net curtain 6 after being formed into the net. In this way, as the fibres are laid on the cage by the suction air flow, the fibres are continuously attracted to the cage, so that if the fibres are not uniform from the cylinder, the web of fibres attracted to the cage will be non-uniform, and in particular if the fibres are of different diameters and lengths, and if the time and speed of passage to the cage are different, non-uniform laying will result.
As shown in fig. 4, the closed circulation type air-laying device includes a cylinder 1, a conveying roller 4 located at an input side of the cylinder 1, a dust cage 2 located at an output side of the cylinder 1, an output screen 6 located at an output side of the dust cage 2, a wind shielding roller 5 provided at an output end of a laying area of the dust cage 2, and a fan 3. After the fibers are conveyed to the cylinder 1 by the conveying roller 4, the fibers are brought to the output side of the cylinder 1 under the action of the cylinder 1, the fibers are adsorbed to the dust cage 2 under the pressing-in and adsorption actions of the fan 3, and under the rotation action of the dust cage 2, the fibers are blocked by the wind blocking roller 5 to form a net on the dust cage 2, and the net is conveyed to the output net curtain 6 after being formed into the net. In this way, as the fibers are laid on the dust cage under the action of the press-in type and adsorption type air flows, the fibers are continuously adsorbed on the dust cage, so that if the feeding is uneven, the fibers from the cylinder are uneven, and meanwhile, the fibers are easy to collide with each other and entangle into a mass in the process of pressing and adsorbing the fibers to the dust cage, so that the dispersion degree of the fibers after the web formation is poor, and the web formation is uneven.
As shown in fig. 5, the press-suction combined type air-laying device includes a cylinder 1, a conveying roller 4 located at an input side of the cylinder 1, a dust cage 2 located at an output side of the cylinder 1, an output mesh curtain 6 located at an output side of the dust cage 2, a wind shielding roller 5 provided at an output end of a web forming area of the dust cage 2, and a fan 3. After the conveying roller 4 conveys the fibers to the cylinder 1, the fibers are brought to the output side of the cylinder 1 under the action of the cylinder 1, the fibers are adsorbed to the dust cage 2 under the pressing-in and adsorption actions of the fan 3, the fibers are blocked on the dust cage 2 through the reverse blocking of the wind blocking roller 5 under the rotation action of the dust cage 2, a net is formed on the dust cage 2, the net is conveyed to the output net curtain 6 after being formed, and the wind supplementing opening 1000 is arranged below the dust cage, so that the pressed-in wind flow is larger than the adsorbed wind flow, and therefore, the wind flow is supplemented from the wind supplementing opening. In this way, as the fibres are laid on the cage by the action of the forced and suction jets, the fibres are continuously attracted to the cage, and as such, the situation described with reference to figures 2 to 4 can also occur, resulting in an uneven lay.
Disclosure of Invention
The first purpose of the invention is to provide a net forming device and an air-laid method for forming auto-leveling by suction coating and free fall.
A second object of the invention is to provide an article which is of uniform thickness. In order to achieve the first purpose, the net forming device capable of automatically adjusting and leveling through suction covering and free falling comprises an air-laid mechanism, wherein the air-laid mechanism comprises a negative pressure adsorption device and a net forming conveying net; an air suction port of the negative pressure adsorption device is positioned in the net-forming conveying net; a net forming surface is formed on the net forming conveying net at the air suction port, the net forming surface is inclined downwards, vertically downwards or horizontally downwards, and a free falling area is arranged below the net forming surface.
The air-laid method of the self-leveling net-forming device formed by suction covering and free fall comprises the following steps: the fiber is continuously conveyed to the position of the net-forming conveying net, the fiber is adsorbed on the net-forming surface under the adsorption action of the negative pressure adsorption device, along with the continuous adsorption of the fiber on the net-forming surface, when the thickness a of the fiber net on the net-forming surface is reached, the adsorption force of the adsorption device at the position is smaller than the gravity of the fiber, the fiber falls into the free falling area at the position, the fiber is continuously adsorbed at the position, which does not reach the thickness a, of the fiber net on the net-forming surface, and the fiber net is continuously output by the continuously running net-forming conveying net.
According to the air-laid device and the air-laid method, when fibers are continuously conveyed to a laid web conveying net, the fibers are continuously adsorbed to a laid web surface under the adsorption action of the negative pressure adsorption device, after the fibers are adsorbed to a certain degree on the laid web surface, the adsorption force of the position where the fibers are adsorbed is larger than that of the position where the fibers are adsorbed, once the negative pressure on the outer surface of the laid web surface where the fibers are adsorbed is smaller than the gravity of the fibers, the fibers fall into the free falling area at the position, and the positions of the fibers on the laid web surface continuously adsorb the fibers, so that the laid web thickness on the laid web surface is uniform; the uniform web is continuously output by the web-forming conveyor. The device and the method can be widely applied to the non-woven field, and can also be applied to the spinning fields such as cotton feeding of carding and sliver making, so that the application range is wide.
Furthermore, the negative pressure adsorption device comprises an air suction pipeline, a negative pressure cavity is arranged in the air suction pipeline, and the negative pressure cavity is provided with an air suction opening and an air outlet; the net-forming conveying net is sleeved outside the air suction pipeline in a rotating mode, the net-forming conveying net is a circular net, and the air suction pipeline and the circular net form a dust cage.
Furthermore, a net curtain which moves synchronously with the net forming conveying net is arranged outside the dust cage, and the net curtain positioned at the air suction port is attached to the net forming surface at the net forming surface.
Furthermore, the net-forming conveying net is a planar annular net curtain.
Furthermore, a wind-shielding roller is arranged at the output end of the net-forming surface, and the running direction of the wind-shielding roller and one side close to the net-forming conveying net is consistent with the moving direction and speed of the net-forming conveying net. By arranging the wind-shielding roller, the phenomenon that the conveyed net is sucked back under the action of negative pressure can be avoided, and the net forming quality is improved.
Furthermore, a carding mechanism is arranged at the input side of the web forming surface. Is used for carding and conveying fibers, and can form a web more uniformly.
Furthermore, the carding mechanism comprises a stripping transfer roller and carding licker-in rollers, the stripping transfer roller is positioned between the carding licker-in rollers and the web forming surface input side, a cleaning roller is arranged above the uppermost carding licker-in roller, the rotating directions of the carding licker-in rollers are the same, and the adjacent carding licker-in rollers have a spacing. The fibers are grabbed by the adjacent carding licker-in rollers and then are carded under the action of the card clothing opposite to the adjacent carding licker-in rollers, the carded fibers are transferred and stripped from the carding licker-in rollers through stripping and transferring rollers, and the stripped fibers are transferred to a net forming surface; the cleaning roller cleans the excessive fibers on the uppermost carding roller, and then the excessive fibers are separated from the cleaning roller. Through the carding of the carding roller, the fibers grabbed by the stripping transfer roller are more uniform and dispersed, and the web forming uniformity can be further improved.
Further, the web thickness a of the web is adjusted by adjusting the suction force of the suction device. In the net forming process of the net forming device for forming the self-leveling by utilizing the suction covering and the free fall, after fibers are adsorbed on a net forming surface by negative pressure, the quantity of the fibers at the position is increased along with the thickening of the fiber net, so that more air openings at the corresponding position of the net forming surface are blocked, the adsorption force on the fibers at the position is reduced, the position with the thickness is not reached, the adsorption force is slightly increased, and the fiber nets with different thicknesses can be obtained by adjusting the adsorption force so as to be suitable for the net forming of the fiber nets with different thicknesses.
In order to achieve the second purpose, the product is manufactured by the negative pressure adsorption free falling type self-leveling air-laid device and the air-laid method. When making an article, the thickness of the article is uniform because the airlaid web is uniform in thickness.
Drawings
FIG. 1 is a schematic view of a free-fall airlaid web.
Fig. 2 is a schematic view of a press-in airlaid.
Fig. 3 is a schematic view of a suction airlaid.
FIG. 4 is a schematic view of a closed-loop airlaid.
Fig. 5 is a schematic view of a combined pressure and suction airlaid web.
Fig. 6 is a schematic view of embodiment 1 of the present invention.
Fig. 7 is a schematic view of another structure in embodiment 1 of the present invention.
Fig. 8 is a schematic view of embodiment 2 of the present invention.
Fig. 9 is a schematic view of a transfer lickerin and airlaid mechanism.
FIG. 10 is a schematic view of a carding machine and an airlaid machine.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1.
As shown in fig. 6, the web forming device for suction coating and free fall forming auto-leveling comprises a fiber feeding mechanism 200, a conveying net curtain 300, a carding mechanism, an air-laying mechanism 100 and an output curtain 700.
The fiber feeding mechanism 200 and the conveying net 300 are arranged in sequence according to the conveying direction of the fibers. The output end of the conveying net curtain 300 is provided with a carding mechanism.
The carding mechanism comprises stripping and transferring rollers 500 and carding licker-in rollers 400, wherein the stripping and transferring rollers 500 are positioned between the carding licker-in rollers 400 and the input side of the web forming surface 101, cleaning rollers 600 are arranged above the uppermost carding licker-in rollers, the rotating directions of the carding licker-in rollers 400 are the same, and the adjacent carding licker-in rollers have a spacing distance. The fibers are carded under the action of the card clothing opposite to the adjacent carding licker-in after being grabbed by the adjacent carding licker-in, the carded fibers are transferred and stripped from the carding licker-in 400 through a stripping and transferring roller 500, and the stripped fibers are transferred to the web forming surface 102; the scrub roller 600 cleans the excess fibers on the uppermost carding wire roller, and then the excess fibers are separated from the scrub roller 600. Through the carding of the carding roller 400, the fibers grabbed by the stripping transfer roller 500 are more uniform and dispersed, and the web forming uniformity can be further improved.
The air-laying mechanism 100 comprises a negative pressure adsorption device 10 and a web-forming conveying net 60.
The negative pressure adsorption device comprises an air suction pipeline 11, an air suction pipe 12 connected to the air outlet of the air suction pipeline, and a fan connected to the air suction pipe 12. The air suction pipe 11 has a negative pressure cavity 111 therein, and the negative pressure cavity 111 has an air suction opening 101 and an air outlet 112.
A net-forming conveying net 60 is sleeved outside the air suction pipeline 11 in a rotating manner, the net-forming conveying net 60 is a circular net, and the air suction pipeline and the circular net form a dust cage.
A net forming surface 102 is formed on the net forming conveying net at the air suction opening 101, the net forming surface 102 is inclined downwards, vertically downwards or horizontally downwards, in the embodiment, the net forming surface 102 is inclined downwards, the net forming surface is always positioned at the air suction opening 101, and a free falling area 900 is arranged below the net forming surface. And a wind shielding roller 5 is arranged at the output end of the net-forming surface, and the running direction of the wind shielding roller 5 and one side close to the net-forming conveying net is consistent with the moving direction and speed of the net-forming conveying net. An output curtain 700 is arranged at the output end of the net-forming conveying net.
The air-laid method of the self-leveling net-forming device formed by suction covering and free fall comprises the following steps: the fibers are fed to the feeding net 300 by the fiber feeding mechanism 200, and the feeding net 300 feeds the fibers to the carding mechanism, so that the fibers are carded by the carding mechanism. When the fibers are continuously conveyed to the dust cage by the stripping and transferring roller 500, the fibers are continuously adsorbed on the web forming surface 102 under the adsorption action of the negative pressure adsorption device, after the fibers are adsorbed on the web forming surface 102 to a certain degree, the adsorption force of the position where the fibers are adsorbed is larger than that of the position where the fibers are adsorbed, once the negative pressure on the fiber web on which the fibers are adsorbed is smaller than the gravity of the fibers, namely the fiber web reaches the thickness a, the fibers fall into the free falling area at the position, and the fibers are continuously adsorbed at the position where the fibers are adsorbed on the web surface, so that the web forming thickness on the web forming surface is uniform, and the fiber web is continuously output by the continuously running web forming conveying net. The device and the method can be widely applied to the non-woven field, and can also be applied to the spinning fields such as cotton feeding of carding and sliver making, so that the application range is wide.
In the present embodiment, the web formation thickness a of the web is adjusted by adjusting the suction force of the suction device, that is, the web formation thickness a of the web is adjusted by the suction force of the fan. In the net forming process of the net forming device for forming the self-leveling by utilizing the suction covering and the free fall, after fibers are adsorbed on a net forming surface by negative pressure, the quantity of the fibers at the position is increased along with the thickening of the fiber net, so that more air openings at the corresponding position of the net forming surface are blocked, the adsorption force on the fibers at the position is reduced, the position with the thickness is not reached, the adsorption force is slightly increased, and the fiber nets with different thicknesses can be obtained by adjusting the adsorption force so as to be suitable for the net forming of the fiber nets with different thicknesses.
According to the requirement, a secondary air-laid mechanism can be arranged at the output end of the output curtain to enable the finished product to be finer and smoother, and the fiber web can reach the required thickness through secondary laying.
As another structure of this example, as shown in fig. 7, a net curtain 80 moving in synchronization with the web forming conveyor net is provided outside the cage, and the net curtain 80 is attached to the web forming surface at the web forming surface. The mesh of the net curtain 80 can be set to be different from the mesh on the cylinder mould according to the requirement.
As shown in fig. 9, the carding mechanism can be replaced by a transfer lickerin 91.
Of course, the carding unit can be replaced by a variety of known carding units, one of which comprises the cylinder 1 and a transfer taker-in 91 at the output side of the cylinder 1, as shown in fig. 10.
Example 2.
As shown in fig. 8, the web forming device for suction coating and free fall forming auto-leveling comprises a fiber feeding mechanism 200, a conveying net curtain 300, a carding mechanism, an air-laying mechanism 100 and an output curtain 700.
The fiber feeding mechanism 200 and the conveying net 300 are arranged in sequence according to the conveying direction of the fibers. The output end of the conveying net curtain 300 is provided with a carding mechanism.
The carding mechanism comprises stripping and transferring rollers 500 and carding licker-in rollers 400, wherein the stripping and transferring rollers 500 are positioned between the carding licker-in rollers 400 and the input side of the web forming surface 101, cleaning rollers 600 are arranged above the uppermost carding licker-in rollers, the rotating directions of the carding licker-in rollers 400 are the same, and the adjacent carding licker-in rollers have a spacing distance. The fibers are carded under the action of the card clothing opposite to the adjacent carding licker-in after being grabbed by the adjacent carding licker-in, the carded fibers are transferred and stripped from the carding licker-in 400 through a stripping and transferring roller 500, and the stripped fibers are transferred to the web forming surface 102; the scrub roller 600 cleans the excess fibers on the uppermost carding wire roller, and then the excess fibers are separated from the scrub roller 600. Through the carding of the carding roller 400, the fibers grabbed by the stripping transfer roller 500 are more uniform and dispersed, and the web forming uniformity can be further improved.
The air-laying mechanism 100 comprises a negative pressure adsorption device 10 and a web-forming conveying net 60.
The negative pressure adsorption device comprises an air suction pipeline 11 and a fan connected to the air suction pipeline 11. The air suction pipe 11 is provided with a negative pressure cavity 111 therein, and the negative pressure cavity 111 is provided with an air suction opening 101.
The web-forming conveying net 60 is a planar annular net curtain.
A net forming surface 102 is formed on the net forming conveying net at the air suction opening 101, the net forming surface 102 is inclined downwards, vertically downwards or horizontally downwards, in the embodiment, the net forming surface 102 is inclined downwards, the net forming surface is always positioned at the air suction opening 101, and a free falling area 900 is arranged below the net forming surface. And a wind shielding roller 5 is arranged at the output end of the net-forming surface, and the running direction of the wind shielding roller 5 and one side close to the net-forming conveying net is consistent with the moving direction and speed of the net-forming conveying net. An output curtain 700 is arranged at the output end of the net-forming conveying net.
The air-laid method of the self-leveling net-forming device formed by suction covering and free fall comprises the following steps: the fibers are fed to the feeding net 300 by the fiber feeding mechanism 200, and the feeding net 300 feeds the fibers to the carding mechanism, so that the fibers are carded by the carding mechanism. When the fibers are continuously conveyed to the web forming surface by the peeling transfer roller 500, the fibers are continuously adsorbed to the web forming surface 102 under the adsorption action of the negative pressure adsorption device, after the fibers are adsorbed to a certain degree on the web forming surface 102, the adsorption force of the position where the fibers are adsorbed is larger than that of the position where the fibers are adsorbed, once the negative pressure on the fiber web on which the fibers are adsorbed is smaller than the gravity of the fibers, namely the fiber web reaches the thickness a, the fibers fall into the free falling area at the position, and the positions where the fibers are adsorbed on the web surface continuously, so that the web forming thickness on the web forming surface is uniform. The device and the method can be widely applied to the non-woven field, and can also be applied to the spinning fields such as cotton feeding of carding and sliver making, so that the application range is wide.
In the present embodiment, the web formation thickness a of the web is adjusted by adjusting the suction force of the suction device, that is, the web formation thickness a of the web is adjusted by the suction force of the fan. In the net forming process of the net forming device which forms self-leveling by utilizing suction coating and free fall, after fibers are adsorbed on a net forming surface by negative pressure, the quantity of the fibers at the position is increased along with the thickening of the fiber net, so that more air openings at the corresponding position of the net forming surface are blocked, the adsorption force on the fibers at the position is reduced, the position with the thickness is not reached, the adsorption force is slightly increased, and the fiber nets with different thicknesses can be obtained by adjusting the adsorption force so as to be suitable for the net forming of the fiber nets with different thicknesses; the web is continuously output by a continuously running web transport web.
According to the requirement, a secondary air-laid mechanism can be arranged at the output end of the output curtain to enable the finished product to be finer and smoother, and the fiber web can reach the required thickness through secondary laying. .
As shown in fig. 9, the carding mechanism can be replaced by a transfer lickerin 91.
Of course, the carding unit can be replaced by a variety of known carding units, one of which comprises the cylinder 1 and a transfer taker-in 91 at the output side of the cylinder 1, as shown in fig. 10.
Example 3.
An article prepared by applying the suction and free fall autolevelling web-forming apparatus and airlaying method of example 1 to a web, the web being consolidated by at least one of the following processes of needlepunching, spunlacing, stitch-bonding, thermal bonding, chemical bonding, felting, and dry papermaking.
Example 4.
An article obtained by applying the suction and free fall autolevelling web-forming apparatus and airlaying method of example 2 to a web, the web being consolidated by at least one of the following processes of needlepunching, spunlacing, stitch-bonding, thermal bonding, chemical bonding, felting, and dry papermaking.
Claims (11)
1. Inhale and cover and form the netting device of auto-leveling with free fall, including air laid mechanism, its characterized in that: the air-laid mechanism comprises a negative pressure adsorption device and a laid net conveying net; an air suction port of the negative pressure adsorption device is positioned in the net-forming conveying net; a net forming surface is formed on the net forming conveying net at the air suction port, the net forming surface is inclined downwards, vertically downwards or horizontally downwards, and a free falling area is arranged below the net forming surface.
2. The suction coating and free fall self-leveling net forming device according to claim 1, characterized in that: the negative pressure adsorption device comprises an air suction pipeline, a negative pressure cavity is arranged in the air suction pipeline, and the negative pressure cavity is provided with an air suction opening and an air outlet; the net-forming conveying net is sleeved outside the air suction pipeline in a rotating mode, the net-forming conveying net is a circular net, and the air suction pipeline and the circular net form a dust cage.
3. The suction coating and free fall self-leveling net forming device according to claim 2, characterized in that: the dust cage is externally provided with a net curtain which moves synchronously with the net forming conveying net, and the net curtain positioned at the air suction port is attached to the net forming surface at the net forming surface.
4. The suction coating and free fall self-leveling net forming device according to claim 1, characterized in that: the net-forming conveying net is a planar annular net curtain.
5. The suction coating and free fall self-leveling net forming device according to claim 1, characterized in that: and the wind-shielding roller is arranged at the output end of the net-forming surface, and the running direction of the wind-shielding roller and one side close to the net-forming conveying net is consistent with the moving direction and speed of the net-forming conveying net.
6. The suction coating and free fall self-leveling net forming device according to claim 1, characterized in that: the input side of the net forming surface is provided with a carding mechanism.
7. The suction coating and free fall auto-leveling webbing forming device of claim 6, wherein: the carding mechanism comprises a stripping transfer roller and a carding licker-in, the stripping transfer roller is positioned between the carding licker-in and the web forming surface input side, and a cleaning roller is arranged above the uppermost carding licker-in; the rotating directions of the carding licker-in rollers are the same, the rotating directions of the stripping transfer roller and the carding licker-in rollers are opposite, and the rotating directions of the cleaning roller and the carding licker-in rollers are opposite. .
8. The method for forming the self-leveling net forming device by suction covering and free falling is characterized in that: the self-leveling net forming device is formed by suction coating and free fall to realize air-laid net formation; the net forming device for forming the auto-leveling by the adsorption and free fall comprises an air-laid mechanism, wherein the air-laid mechanism comprises a negative pressure adsorption device and a net forming conveying net; an air suction port of the negative pressure adsorption device is positioned in the net-forming conveying net; a net forming surface is formed on the net forming conveying net at the air suction port, the net forming surface is inclined downwards, vertically downwards or horizontally downwards, and a free falling area is arranged below the net forming surface;
the method for air laying comprises the following steps: the fibers are continuously conveyed to a web-forming conveying net, the fibers are adsorbed to a web-forming surface under the adsorption action of a negative pressure adsorption device, and along with the continuous adsorption of the fibers on the web-forming surface, when the thickness a of the fiber web on the web-forming surface is reached, the adsorption force of the adsorption device at the position is smaller than the gravity of the fibers, the fibers fall into a free falling area at the position, and the fibers are continuously adsorbed at the position, which does not reach the thickness a, of the fiber web on the web-forming surface; the web is continuously output by a continuously running web transport web.
9. The suction coating and free fall self-leveling web forming device method of claim 8, wherein: the web thickness a of the web is adjusted by adjusting the suction force of the suction device.
10. An article characterized by: an article made by the suction coating and free fall self-leveling netting device of any of claims 1-7.
11. An article characterized by: an article made by the method of laying a web with suction coating and free fall forming self-leveling as claimed in claim 8 or 9 and subsequent processes.
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| CN201911262177.8A CN110965204A (en) | 2019-12-10 | 2019-12-10 | Net forming device and method for forming self-leveling by suction coating and free fall and product |
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